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INA237: I2C Question

Allan Fan
Expert 7700 points

Part Number: INA237

Hi experts,

Customer is surveying INA237 and would like to know if the ADC is configured with the following settings, what will be the required I2C read frequency? The main concern is that if the read/write frequency is too high, it might impact or interfere with other slave devices on the same I2C bus.

 

  • MODE=Bh = Continuous shunt and bus voltage
  • VBUSCT= 5h = 1052 µs
  • VSHCT= 5h = 1052 µs
  • AVG=7h = 1024

 

BR,

Allan

 

  • 0
    TI__Mastermind 29865 points

    Hey Allan,

    The total conversion time is (VBUSCT + VSHCT) * AVG, which would be (1052µ + 1052µ) * 1024 = 2.154496 seconds. This means that you will have results every 2.154496 seconds (with some device to device variation). However, the frequency you read the device is up to you. You can also configure the conversion ready flag to trigger the alert pin if you want a hardware alert every time results are ready.

    Regards,

    Mitch